By David Helman
FOX Sports Dallas Cowboys Writer
OXNARD, Calif. — It feels strange to talk legacy with Ezekiel Elliott.
The Cowboys’ running back came into the league at the age of 20, and he has been a young player on a team of veterans ever since.
All of a sudden, it’s year seven, and Elliott — as he was reminded on Wednesday — has the second-most rushing yards among active NFL running backs. His 7,386 career rushing yards trail only…